Those who can, do. Those who can’t, teach. And those who can’t teach, teach teaching.As a professor myself, I don’t love that old saying, but it’s at least partly true. There is, however, something that those who can’t teach do beside teach teaching: they are pretty good at shooting messengers.America’s education schools are organizing against a horrible threat: someone is planning to rat them out , excuse me, rate them on their performance. US News and World Report plans to publish an annual rating of ed schools and this prospect makes the ed schools twitchy. It should.Teacher ed programs, with some sterling exceptions, are widely considered to be among the lamest, least useful departments in the academy.Increasingly, American colleges just give all their students A’s. One suspects that this would be only grading system that would satisfy the teacher ed programs, but C’s, D’s and F’s should be liberally applied.